US4504534A - Core material for automobile bumpers - Google Patents

Core material for automobile bumpers Download PDF

Info

Publication number
US4504534A
US4504534A US06/619,693 US61969384A US4504534A US 4504534 A US4504534 A US 4504534A US 61969384 A US61969384 A US 61969384A US 4504534 A US4504534 A US 4504534A
Authority
US
United States
Prior art keywords
core material
particles
propylene
compression
molded article
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/619,693
Other languages
English (en)
Inventor
Akira Adachi
Takashi Kubota
Yukio Okada
Kenichi Miyazaki
Taro Hagiwara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JSP Corp
Nissan Motor Co Ltd
Original Assignee
JSP Corp
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=14413589&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US4504534(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by JSP Corp, Nissan Motor Co Ltd filed Critical JSP Corp
Application granted granted Critical
Publication of US4504534A publication Critical patent/US4504534A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/18—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact
    • B60R19/22—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by the cross-section; Means within the bumper to absorb impact containing mainly cellular material, e.g. solid foam
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/05—Use of one or more blowing agents together
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/15—Aging of foamed resin products
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/16—Molding foamed polypropylen articles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/18—Cross-linking a thermoplastic linear foam during molding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/23—Sheet including cover or casing
    • Y10T428/233—Foamed or expanded material encased
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/23—Sheet including cover or casing
    • Y10T428/239—Complete cover or casing

Definitions

  • This invention relates to a core material for use in the production of automobile bumpers.
  • plastic bumpers are made of metallic bars.
  • plastic bumpers are usually composed of a core material of a plastic foam and a surface material of a synthetic resin, etc. enclosing the foam core.
  • Polyurethane, polyethylene and polystyrene foams have been proposed as the foam core material.
  • the foam core material is an important component part which affects the performance of an automobile bumper, and is generally required to have excellent energy absorbing property and dimensional recovery. Furthermore, to decrease the weight of an automobile, the bumper core material should be of low density.
  • the polyurethane foam proposed as a core material for bumpers has excellent energy absorbing property and dimensional recovery, but its density is high (usually 0.09 to 0.15 g/cm 3 ). Hence, it has a large weight and its cost is high.
  • the polyethylene foam has the defect of being inferior in energy absorbing property and heat resistance.
  • the polystyrene foam on the other hand, has poor dimensional recovery and impact strength.
  • the conventional core material for automobile bumpers have advantages and disadvantages, and no core material has been obtained which can simultaneously meet the three requirements (1), (2) and (3) for bumper cores. (1) They should have excellent energy absorbing properties. (2) They should have an excellent dimensional recovery. (3) They should be of low density for lighter weights of bumpers.
  • a molded article of foamed particles of a polypropylene-type resin which has a density of 0.015 to 0.045 g/cm 3 and a compression stress at 50% compression of at least 1 kg/cm 2 .
  • the present invention provides a core material for automobile bumpers, said core material being composed of a molded article of foamed particles of a polypropylene-type resin, said article having a density of 0.015 to 0.045 g/cm 3 and a compression stress at 50% compression of at least 1 kg/cm 2 .
  • the polypropylene-type resin constituting the core material in accordance with this invention denotes a homopolymer of propylene or a copolymer of propylene with 1 to 30% by weight, preferably 1 to 5%, of an ethylenically unsaturated monomer copolymerizable with it.
  • the polymer or copolymer may be a composition containing up to 40% by weight, preferably up to 30% by weight, of low-density polyethylene, an ethylene/vinyl acetate copolymer or both.
  • An ethylene-propylene random copolymer is a preferred copolymer.
  • the polypropylene-type resins may be crosslinked or non-crosslinked, but is preferably non-crosslinked.
  • the molded article of foamed particles of the polypropylene-type resin which constitutes the core material of this invention, denotes a molded article obtained by feeding preliminarily foamed particles of the polypropylene-type resin in a mold capable of enclosing the particles but allowing escape of gases therefrom, and heating the foamed particles at a temperature at which the resin particles expand and soften and melt-adhere to each other into a mass, whereby a foamed molded article expanded to the same shape and size as the cavity of the mold is formed.
  • the molded article of foamed particles has better energy absorbing property and dimensional recovery than an extruded and foamed article obtained by mixing a molten polypropylene-type resin with a blowing agent in an extruder, and extruding the mixture from the extruder to expand the resin.
  • preliminarily foamed particles are prepared by dispersing particles of the polypropylene-type resin and a volatile blowing agent in water in a closed vessel, heating the dispersion at a temperature at which the particles soften or at a higher temperature thereby impregnating the particles with the blowing agent, thereafter opening one end of the vessel, and while maintaining the pressure of the inside of the vessel at a predetermined value, releasing the particles and water into an atmosphere kept at a lower pressure than the inside of the vessel. Thereafter, the preliminarily foamed particles are pressurized and aged by using an inorganic gas or a mixture of it with a volatile blowing agent to impart an elevated pressure to the inside of the particles.
  • the preliminarily foamed particles are filled in a mold capable of enclosing the particles but allowing escape of gases therefrom.
  • the particles are heated to expand them whereby the particles melt-adhere to each other to form a molded article having a shape conforming to the mold.
  • the core material of the invention should have a density in the range of 0.015 to 0.045 g/cm 3 , preferably 0.02 to 0.035 g/cm 3 . If it is less than 0.015 g/cm 3 , the core material has poor energy absorbing property. If it exceeds 0.045 g/cm 3 , it has a poor dimensional recovery and cannot withstand use in automobile bumpers.
  • FIG. 1 is a perspective view of an automobile bumper having the core material of this invention, with a part of the outer covering material removed;
  • FIG. 2 is a longitudinal sectional view taken along line II--II of FIG. 1;
  • FIG. 3 is a graph showing a stress-strain curve of the core material.
  • a core material 1 of this invention for automobile bumpers is formed in substantially the same shape as a finished automobile bumper by molding preliminarily foamed particles of the polypropylene-type resin.
  • the core material 1 so formed is covered with a surface covering material 2 made of polyurethane, polypropylene, polyethylene, etc. to produce an automobile bumper 3.
  • the core material and the surface covering material may, or may not, be bonded into a one-piece structure by such means as adhesion or melt-adhesion.
  • the core material 1 and the surface covering material 2 may also be molded into a one-piece structure. Or they may first be produced separately, and the covering material 2 may be applied to the core material 1.
  • the preliminarily foamed particles obtained were left to stand at room temperature and atmospheric pressure for 48 hours, and put in a pressurized vessel where they were pressurized and aged at a temperature of 20° C. under a pressure of 2 kg/cm 2 .G.
  • the aged particles were filled in a mold which could enclose the particles but allowed escape of gases therefrom and which had a cavity of the same shape as the intended core material, and heated with steam under 3.2 kg/cm 2 .G to foam and expand them.
  • a core material having the shape conforming to the cavity of the mold was obtained.
  • Table 1 summarizes the densities and compression stresses at 50% compression of the various core materials obtained.
  • the core materials were subjected to tests for the efficiency of energy absorption, dimensional recovery and heat resistance. The results are shown in Table 1.
  • the core material of this invention can meet the three requirements for core materials of automobile bumpers. Specifically, it has excellent energy absorbing property, an excellent dimensional recovery, and a low density that is conductive to lighter weights of automobiles. Moreover, it is low in cost and also has superior heat resistance, impact strength, shape retention, dimensional accuracy and chemical resistance.
  • a core material made of a polystyrene foam may produce a sound of friction between it and a polyurethane outer covering material when it is subjected to an external force, and this sound is likely to detract from the marketing value of the bumper.
  • the core material of this invention does not produce such a frictional sound.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Molding Of Porous Articles (AREA)
US06/619,693 1982-06-19 1984-06-13 Core material for automobile bumpers Expired - Lifetime US4504534A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP57105660A JPS58221745A (ja) 1982-06-19 1982-06-19 自動車のバンパ−用芯材
JP57-105660 1982-06-19
US50428983A 1983-06-14 1983-06-14

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US50428983A Division 1982-06-19 1983-06-14

Publications (1)

Publication Number Publication Date
US4504534A true US4504534A (en) 1985-03-12

Family

ID=14413589

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/619,693 Expired - Lifetime US4504534A (en) 1982-06-19 1984-06-13 Core material for automobile bumpers

Country Status (5)

Country Link
US (1) US4504534A (de)
EP (1) EP0097504B1 (de)
JP (1) JPS58221745A (de)
CA (1) CA1201250A (de)
DE (1) DE3368896D1 (de)

Cited By (54)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4567208A (en) * 1983-12-07 1986-01-28 Japan Styrene Paper Corporation Preliminarily foamed particles of non-crosslinked polypropylene-type resin
US4598001A (en) * 1983-03-24 1986-07-01 Japan Styrene Paper Corporation Bumper core and process producing same
US4600636A (en) * 1984-03-08 1986-07-15 Japan Styrene Paper Corporation Core material for an automobile bumper
US4617323A (en) * 1984-02-13 1986-10-14 Japan Styrene Paper Corporation Prefoamed particles of crosslinked propylene-type resin and molded article prepared therefrom
US4626555A (en) * 1984-11-09 1986-12-02 Mitsubishi Yuka Badische Co., Ltd. Polypropylene foamed particles
US4645249A (en) * 1984-08-14 1987-02-24 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Core for an automobile bumper
US4657937A (en) * 1985-02-04 1987-04-14 Japan Styrene Paper Corporation Energy absorber
US4671550A (en) * 1985-07-01 1987-06-09 Arpi Co. Bumper beam
US4692507A (en) * 1985-03-20 1987-09-08 Japan Styrene Paper Corporation Propylene-base random copolymer particles and production process thereof
US4695593A (en) * 1986-02-21 1987-09-22 Japane Styrene Paper Corporation Prefoamed propylene polymer-base particles, expansion-molded article produced from said particles and production process of said article
US4715645A (en) * 1986-03-12 1987-12-29 Ford Motor Company Bumper bar for a motor vehicle
US4756948A (en) * 1986-07-22 1988-07-12 Japan Styrene Paper Corporation Core material for automobile bumpers
US4766157A (en) * 1984-09-03 1988-08-23 Sumitomo Chemical Company, Limited Foamed particles of propylene-type polymer
US4908393A (en) * 1988-03-24 1990-03-13 Mitsubishi Yuka Badische Co., Ltd. Propylene resin foamed particles and foamed mold article
WO1991010705A1 (en) * 1990-01-11 1991-07-25 Shanelec Dennis A Molded polypropylene foam tire cores
US5096243A (en) * 1990-02-05 1992-03-17 Davidson Textron Inc. Bumper assembly having a rim box section
US5711562A (en) * 1995-08-24 1998-01-27 Aisin Seiki Kabushiki Kaisha Bumper assembly for vehicles
US5725940A (en) * 1992-10-27 1998-03-10 Mitsui Toatsu Chemicals, Inc. Composite molded article and method for making same
US5844009A (en) * 1996-04-26 1998-12-01 Sentinel Products Corp. Cross-linked low-density polymer foam
US5859076A (en) * 1996-11-15 1999-01-12 Sentinel Products Corp. Open cell foamed articles including silane-grafted polyolefin resins
US5878685A (en) * 1997-09-30 1999-03-09 Zodiac Hurricane Technologies, Inc. Foam collar and boat incorporating same
US5883145A (en) * 1994-09-19 1999-03-16 Sentinel Products Corp. Cross-linked foam structures of polyolefins and process for manufacturing
US5882776A (en) * 1996-07-09 1999-03-16 Sentinel Products Corp. Laminated foam structures with enhanced properties
US5929129A (en) * 1994-09-19 1999-07-27 Sentinel Products Corp. Crosslinked foamable compositions of silane-grafted, essentially linear polyolefins blended with polypropylene
US5932659A (en) * 1994-09-19 1999-08-03 Sentinel Products Corp. Polymer blend
US5938878A (en) 1996-08-16 1999-08-17 Sentinel Products Corp. Polymer structures with enhanced properties
US6034144A (en) * 1998-06-11 2000-03-07 Jsp Corporation Molded article of foamed and expanded beads of propylene resin
US6077875A (en) * 1998-03-23 2000-06-20 Jsp Corporation Foamed and expanded beads of polypropylene resin for molding
US6133331A (en) * 1996-12-13 2000-10-17 Jsp Corporation Expanded particles of polyolefin resin and process for preparing the same
US6167790B1 (en) 1996-07-09 2001-01-02 Sentinel Products Corp. Laminated foam structures with enhanced properties
US6191178B1 (en) * 1998-02-03 2001-02-20 Jsp Corporation Polycarbonate resin foam and shock absorber using the same
US6296299B1 (en) * 1998-03-31 2001-10-02 Mazda Motor Corporation Frame structure for vehicle body
US6313184B1 (en) 1997-12-01 2001-11-06 Jsp Corporation Expanded polypropylene resin beads and a molded article
US6350512B1 (en) 1996-04-26 2002-02-26 Sentinel Products Corp. Cross-linked polyolefin foam
US6451419B1 (en) 1996-08-12 2002-09-17 Jsp Corporation Shock absorbing material
US6547996B1 (en) 1997-06-18 2003-04-15 Jsp Corporation Production apparatus of expansion-molded article, auxiliary member for transfer of foamed particles and production method of expansion-molded article
US6688661B2 (en) * 2000-02-28 2004-02-10 Fuji Jukogyo Kabushiki Kaisha Bumper beam
US20040056491A1 (en) * 2002-08-28 2004-03-25 Jsp Corporation Bumper core
US20040174024A1 (en) * 2003-03-04 2004-09-09 Jsp Corporation Vehicle bumper structure
US6793256B2 (en) 2001-12-17 2004-09-21 Jsp Licenses, Inc. Vehicle bumper energy absorber system and method
US6818161B2 (en) 1997-04-01 2004-11-16 Jsp Corporation Molded body of thermoplastic resin having sound absorption characteristics
US20040254254A1 (en) * 2003-06-12 2004-12-16 Jsp Corporation Expanded polypropylene resin beads and process for the production thereof
US6875484B1 (en) * 1999-08-09 2005-04-05 Jsp Corporation Multi-layer expansion-molded article of polypropylene resin, production process thereof, and container, shock-absorbing material for automobile and automotive member formed of the multi-layer expansion-molded article of polypropylene resin
US20050196233A1 (en) * 2003-09-10 2005-09-08 P.V. Vijay Blocks for absorption of collision energy
US20070066757A1 (en) * 2005-09-22 2007-03-22 Corcoran Patrick H Method of producing adherent coatings on resinous substrates
US20100112358A1 (en) * 2005-09-22 2010-05-06 Corcoran Patrick H Adherent coating compositions for resinous substrates
US9376074B2 (en) 2014-04-25 2016-06-28 GM Global Technology Operations LLC Architected automotive impact beam
US9475434B2 (en) 2014-08-07 2016-10-25 GM Global Technology Operations LLC Designs and processes for using discrete stiffeners to create light, stiff and strong automotive structures
US9511540B2 (en) 2014-08-07 2016-12-06 GM Global Technology Operations LLC Process for securing a micro-truss structure to a panel
US9561620B2 (en) 2014-08-07 2017-02-07 GM Global Technology Operations LLC Process for securing discrete stiffeners to a panel
US9598111B2 (en) 2014-08-29 2017-03-21 GM Global Technology Operations LLC Microtruss replacing structural foam in body structural application
US9751287B2 (en) 2014-04-17 2017-09-05 GM Global Technology Operations LLC Low energy process for making curved sandwich structures with little or no residual stress
US9884436B2 (en) 2014-04-17 2018-02-06 GM Global Technology Operations LLC Method for making a curved sandwich structure using a reconfigurable UV source mounting element
US10105941B2 (en) 2014-04-25 2018-10-23 GM Global Technology Operations LLC Stiffening and/or strengthening a structural member using a pre-made microtruss insert

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3936194A1 (de) * 1989-10-31 1991-05-02 Basf Ag Wiederaufarbeitbares stossfaengersystem
DE4101806A1 (de) * 1991-01-23 1992-07-30 Basf Ag Schockabsorbierende propylenpolymer-verbundformteile
DE9210176U1 (de) * 1992-07-30 1993-08-26 Späth, Walter E., 78256 Steißlingen Stoßstange für Kraftfahrzeuge u. dgl.
US20080048462A1 (en) * 2006-08-02 2008-02-28 Meridian Automotive System, Inc. Thermoplastic composite bumper system
CN102700045A (zh) * 2012-06-20 2012-10-03 浙江吉利汽车研究院有限公司杭州分公司 聚丙烯物理发泡制备汽车保险杠的方法

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3616172A (en) * 1969-01-21 1971-10-26 Dow Chemical Co Foam composites for filling enclosed spaces
US4075380A (en) * 1973-10-12 1978-02-21 N. V. Bekaert S. A. Construction panels
US4150077A (en) * 1977-01-24 1979-04-17 Conwed Corporation Reducing the aging period of gaseous expansion agent foams
US4256803A (en) * 1979-01-11 1981-03-17 Societe Anonyme Dite Stratiforme Panel based on polycondensable resin and a method for the manufacture of this panel
US4324834A (en) * 1980-06-05 1982-04-13 Nrg Research Laboratories, Inc. Insulation means and method
US4328986A (en) * 1978-04-07 1982-05-11 Ex-Cell-O Corporation Multi-media energy absorbers (flex straddle)
US4350378A (en) * 1979-08-29 1982-09-21 Aisin Seiki Kabushiki Kaisha Bumper for use on vehicles
US4361352A (en) * 1979-05-21 1982-11-30 Aisin Seiki Kabushiki Kaisha Bumper for vehicles
US4399087A (en) * 1980-06-25 1983-08-16 Japan Styrene Paper Corporation Process for producing foamed polyolefin articles from aged pre-foamed particles of polyolefin resins
US4413856A (en) * 1981-08-07 1983-11-08 General Motors Corporation Hardbar energy absorbing bumper system for vehicles

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1072001B (it) * 1976-11-15 1985-04-10 Stars Spa Paraurti ad assorbimento di energia particolarmente per autovetture
JPS5740136A (en) * 1980-08-21 1982-03-05 Mitsuboshi Belting Ltd Shock energy absorbing bumper for vehicle
JPS5923731B2 (ja) * 1980-11-22 1984-06-04 日本スチレンペ−パ−株式会社 ポリプロピレン系樹脂予備発泡粒子

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3616172A (en) * 1969-01-21 1971-10-26 Dow Chemical Co Foam composites for filling enclosed spaces
US4075380A (en) * 1973-10-12 1978-02-21 N. V. Bekaert S. A. Construction panels
US4150077A (en) * 1977-01-24 1979-04-17 Conwed Corporation Reducing the aging period of gaseous expansion agent foams
US4328986A (en) * 1978-04-07 1982-05-11 Ex-Cell-O Corporation Multi-media energy absorbers (flex straddle)
US4256803A (en) * 1979-01-11 1981-03-17 Societe Anonyme Dite Stratiforme Panel based on polycondensable resin and a method for the manufacture of this panel
US4361352A (en) * 1979-05-21 1982-11-30 Aisin Seiki Kabushiki Kaisha Bumper for vehicles
US4350378A (en) * 1979-08-29 1982-09-21 Aisin Seiki Kabushiki Kaisha Bumper for use on vehicles
US4324834A (en) * 1980-06-05 1982-04-13 Nrg Research Laboratories, Inc. Insulation means and method
US4399087A (en) * 1980-06-25 1983-08-16 Japan Styrene Paper Corporation Process for producing foamed polyolefin articles from aged pre-foamed particles of polyolefin resins
US4413856A (en) * 1981-08-07 1983-11-08 General Motors Corporation Hardbar energy absorbing bumper system for vehicles

Cited By (74)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4598001A (en) * 1983-03-24 1986-07-01 Japan Styrene Paper Corporation Bumper core and process producing same
US4567208A (en) * 1983-12-07 1986-01-28 Japan Styrene Paper Corporation Preliminarily foamed particles of non-crosslinked polypropylene-type resin
US4617323A (en) * 1984-02-13 1986-10-14 Japan Styrene Paper Corporation Prefoamed particles of crosslinked propylene-type resin and molded article prepared therefrom
US4600636A (en) * 1984-03-08 1986-07-15 Japan Styrene Paper Corporation Core material for an automobile bumper
USRE32780E (en) * 1984-03-08 1988-11-08 Japan Styrene Paper Corporation Core material for an automobile bumper
US4645249A (en) * 1984-08-14 1987-02-24 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Core for an automobile bumper
US4766157A (en) * 1984-09-03 1988-08-23 Sumitomo Chemical Company, Limited Foamed particles of propylene-type polymer
US4626555A (en) * 1984-11-09 1986-12-02 Mitsubishi Yuka Badische Co., Ltd. Polypropylene foamed particles
US4657937A (en) * 1985-02-04 1987-04-14 Japan Styrene Paper Corporation Energy absorber
US4692507A (en) * 1985-03-20 1987-09-08 Japan Styrene Paper Corporation Propylene-base random copolymer particles and production process thereof
US4671550A (en) * 1985-07-01 1987-06-09 Arpi Co. Bumper beam
US4695593A (en) * 1986-02-21 1987-09-22 Japane Styrene Paper Corporation Prefoamed propylene polymer-base particles, expansion-molded article produced from said particles and production process of said article
US4715645A (en) * 1986-03-12 1987-12-29 Ford Motor Company Bumper bar for a motor vehicle
US4756948A (en) * 1986-07-22 1988-07-12 Japan Styrene Paper Corporation Core material for automobile bumpers
US4908393A (en) * 1988-03-24 1990-03-13 Mitsubishi Yuka Badische Co., Ltd. Propylene resin foamed particles and foamed mold article
WO1991010705A1 (en) * 1990-01-11 1991-07-25 Shanelec Dennis A Molded polypropylene foam tire cores
US5073444A (en) * 1990-01-11 1991-12-17 Shanelec Dennis A Molded polypropylene foam tire cores
US5096243A (en) * 1990-02-05 1992-03-17 Davidson Textron Inc. Bumper assembly having a rim box section
US5725940A (en) * 1992-10-27 1998-03-10 Mitsui Toatsu Chemicals, Inc. Composite molded article and method for making same
US6316512B1 (en) 1994-09-19 2001-11-13 Sentinel Products Corp. Silane-grafted materials for solid and foam applications
US5929129A (en) * 1994-09-19 1999-07-27 Sentinel Products Corp. Crosslinked foamable compositions of silane-grafted, essentially linear polyolefins blended with polypropylene
US6103775A (en) * 1994-09-19 2000-08-15 Sentinel Products Corp. Silane-grafted materials for solid and foam applications
US5883145A (en) * 1994-09-19 1999-03-16 Sentinel Products Corp. Cross-linked foam structures of polyolefins and process for manufacturing
US5932659A (en) * 1994-09-19 1999-08-03 Sentinel Products Corp. Polymer blend
US5711562A (en) * 1995-08-24 1998-01-27 Aisin Seiki Kabushiki Kaisha Bumper assembly for vehicles
US5844009A (en) * 1996-04-26 1998-12-01 Sentinel Products Corp. Cross-linked low-density polymer foam
US6472015B1 (en) 1996-04-26 2002-10-29 Sentinal Products Corp. Cross-linked polyolefin tape
US6350512B1 (en) 1996-04-26 2002-02-26 Sentinel Products Corp. Cross-linked polyolefin foam
US6004647A (en) * 1996-06-21 1999-12-21 Sentinel Products Corp. Polymer blend
US6359021B2 (en) 1996-06-21 2002-03-19 Sentinel Products Corp. Polymer blend
US6531520B1 (en) 1996-06-21 2003-03-11 Sentinel Products Corporation Polymer blend
US6214894B1 (en) 1996-06-21 2001-04-10 Sentinel Products Corp. Ethylene-styrene single-site polymer blend
US5882776A (en) * 1996-07-09 1999-03-16 Sentinel Products Corp. Laminated foam structures with enhanced properties
US6167790B1 (en) 1996-07-09 2001-01-02 Sentinel Products Corp. Laminated foam structures with enhanced properties
US6451419B1 (en) 1996-08-12 2002-09-17 Jsp Corporation Shock absorbing material
US6054005A (en) 1996-08-16 2000-04-25 Sentinel Products Corp. Polymer structures with enhanced properties
US5938878A (en) 1996-08-16 1999-08-17 Sentinel Products Corp. Polymer structures with enhanced properties
US5859076A (en) * 1996-11-15 1999-01-12 Sentinel Products Corp. Open cell foamed articles including silane-grafted polyolefin resins
US6242503B1 (en) 1996-11-15 2001-06-05 Sentinel Products Corp. Polymer articles including maleic anhydride and ethylene-vinyl acetate copolymers
US6262137B1 (en) 1996-11-15 2001-07-17 Sentinel Products Corp. Polymer articles including maleic anhydride and ethylene-vinyl acetate copolymers
US6133331A (en) * 1996-12-13 2000-10-17 Jsp Corporation Expanded particles of polyolefin resin and process for preparing the same
US6818161B2 (en) 1997-04-01 2004-11-16 Jsp Corporation Molded body of thermoplastic resin having sound absorption characteristics
US6547996B1 (en) 1997-06-18 2003-04-15 Jsp Corporation Production apparatus of expansion-molded article, auxiliary member for transfer of foamed particles and production method of expansion-molded article
EP0905016A3 (de) * 1997-09-30 2001-02-28 Zodiac Hurricane Technologies, Inc. Fender aus Schaummaterial und damit ausgerüstetes Boot
US5878685A (en) * 1997-09-30 1999-03-09 Zodiac Hurricane Technologies, Inc. Foam collar and boat incorporating same
US6313184B1 (en) 1997-12-01 2001-11-06 Jsp Corporation Expanded polypropylene resin beads and a molded article
US6191178B1 (en) * 1998-02-03 2001-02-20 Jsp Corporation Polycarbonate resin foam and shock absorber using the same
US6077875A (en) * 1998-03-23 2000-06-20 Jsp Corporation Foamed and expanded beads of polypropylene resin for molding
US6296299B1 (en) * 1998-03-31 2001-10-02 Mazda Motor Corporation Frame structure for vehicle body
US6034144A (en) * 1998-06-11 2000-03-07 Jsp Corporation Molded article of foamed and expanded beads of propylene resin
US6875484B1 (en) * 1999-08-09 2005-04-05 Jsp Corporation Multi-layer expansion-molded article of polypropylene resin, production process thereof, and container, shock-absorbing material for automobile and automotive member formed of the multi-layer expansion-molded article of polypropylene resin
US6688661B2 (en) * 2000-02-28 2004-02-10 Fuji Jukogyo Kabushiki Kaisha Bumper beam
US6793256B2 (en) 2001-12-17 2004-09-21 Jsp Licenses, Inc. Vehicle bumper energy absorber system and method
US6890009B2 (en) 2002-08-28 2005-05-10 Jsp Corporation Bumper core
US20040056491A1 (en) * 2002-08-28 2004-03-25 Jsp Corporation Bumper core
CN100418810C (zh) * 2002-08-28 2008-09-17 株式会社Jsp 保险杠芯体
US6983964B2 (en) 2003-03-04 2006-01-10 Jsp Corporation Vehicle bumper structure
US20040174024A1 (en) * 2003-03-04 2004-09-09 Jsp Corporation Vehicle bumper structure
US20040254254A1 (en) * 2003-06-12 2004-12-16 Jsp Corporation Expanded polypropylene resin beads and process for the production thereof
US7259189B2 (en) 2003-06-12 2007-08-21 Jsp Corporation Expanded polypropylene resin beads and process for the production thereof
US20070197673A1 (en) * 2003-06-12 2007-08-23 Jsp Corporation Foamed molding of expanded polypropylene resin beads
US20050196233A1 (en) * 2003-09-10 2005-09-08 P.V. Vijay Blocks for absorption of collision energy
US7763679B2 (en) * 2005-09-22 2010-07-27 E.I. Du Pont De Nemours And Company Adherent coating compositions for resinous substrates
US20100112358A1 (en) * 2005-09-22 2010-05-06 Corcoran Patrick H Adherent coating compositions for resinous substrates
US7714069B2 (en) * 2005-09-22 2010-05-11 E. I. Du Pont De Nemours And Company Method of producing adherent coatings on resinous substrates
US20070066757A1 (en) * 2005-09-22 2007-03-22 Corcoran Patrick H Method of producing adherent coatings on resinous substrates
US9751287B2 (en) 2014-04-17 2017-09-05 GM Global Technology Operations LLC Low energy process for making curved sandwich structures with little or no residual stress
US9884436B2 (en) 2014-04-17 2018-02-06 GM Global Technology Operations LLC Method for making a curved sandwich structure using a reconfigurable UV source mounting element
US9376074B2 (en) 2014-04-25 2016-06-28 GM Global Technology Operations LLC Architected automotive impact beam
US10105941B2 (en) 2014-04-25 2018-10-23 GM Global Technology Operations LLC Stiffening and/or strengthening a structural member using a pre-made microtruss insert
US9475434B2 (en) 2014-08-07 2016-10-25 GM Global Technology Operations LLC Designs and processes for using discrete stiffeners to create light, stiff and strong automotive structures
US9511540B2 (en) 2014-08-07 2016-12-06 GM Global Technology Operations LLC Process for securing a micro-truss structure to a panel
US9561620B2 (en) 2014-08-07 2017-02-07 GM Global Technology Operations LLC Process for securing discrete stiffeners to a panel
US9598111B2 (en) 2014-08-29 2017-03-21 GM Global Technology Operations LLC Microtruss replacing structural foam in body structural application

Also Published As

Publication number Publication date
EP0097504A3 (en) 1984-12-19
EP0097504A2 (de) 1984-01-04
EP0097504B1 (de) 1987-01-07
JPS58221745A (ja) 1983-12-23
CA1201250A (en) 1986-02-25
DE3368896D1 (en) 1987-02-12

Similar Documents

Publication Publication Date Title
US4504534A (en) Core material for automobile bumpers
CA1108350A (en) Expanded particulate material of polyolefin resin
US4399087A (en) Process for producing foamed polyolefin articles from aged pre-foamed particles of polyolefin resins
US4436840A (en) Process for producing pre-foamed particles of polyolefin resin
US4600636A (en) Core material for an automobile bumper
US4598001A (en) Bumper core and process producing same
EP0071981B1 (de) Geschäumte Formkörper aus Polypropylen-Harz
JPH0313057B2 (de)
EP1055701B1 (de) Polycarbonade schaumstoff und seiner verwendung als stossdämpfer
JPS5943490B2 (ja) ポリプロピレン系合成樹脂発泡成型体
US4657937A (en) Energy absorber
EP0153464A2 (de) Verfahren zur Vernetzung eines geformten, expandierten Polyolefingegenständes
US3755518A (en) Production of flexible and resilient foamed plastics
JPS5920690B2 (ja) ポリオレフィン系樹脂予備発泡粒子
JP2675373B2 (ja) 自動車用バンパー芯材
JP3126449B2 (ja) ポリオレフィン系樹脂発泡粒子
EP0337584B1 (de) Verfahren zur Herstellung von geschäumten Polypropylenharzpartikeln
JPS625455B2 (de)
JPH0139335B2 (de)
JPH0218225B2 (de)
JPH07137067A (ja) 自動車バンパー用芯材の製造方法
JPS6032835A (ja) ポリオレフィン系樹脂発泡成型体の製造方法
JPS5844092B2 (ja) 架橋ポリオレフィン樹脂発泡粒子
JPH0362543B2 (de)
JPH0447699B2 (de)

Legal Events

Date Code Title Description
STCF Information on status: patent grant

Free format text: PATENTED CASE

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FPAY Fee payment

Year of fee payment: 12